# Questions tagged [calculation-puzzle]

A puzzle that involves numerical calculations, such as multiplication and addition.

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### Elementary vowel equations

Challenge Solve the following equations by converting to standard form (see below): ** eeeeee = aeeeeiiiouu ...
265k views

### 1 2 3 4 5 6 7 8 9 = 1

This question inspired me to write the same puzzle but instead replace the "= 100" with "= 1" with similar requirements and restrictions. What is the expression with the fewest number of operators ...
192 views

### How can i move forward (kenken)

I can't seem to find a next step to logically come to without guesswork. Any ideas on how to move forward?
386 views

### Dividing money in school [closed]

A businessman instituted an annual award in a city school, with part of the award given to the school itself to improve its facilities. It was stated that if a student from a wealthy family were to ...
937 views

### What is the next number to appear in this sequence?

$1, 1, 0, -2, 4, 18, 328, 107638 ,?$ This problem can be complex, use your imagination. Hint: Hint 2: Hint 3: Hint 4: Hint 5: Hint 6: Hint 7:
2k views

### A game of multiplication and addition

Carol is playing a game with Alice and Bob. She secretly chooses two integers between 1 and 10 and gives the sum to Alice and the product to Bob. After some time, the following discussion occurs: ...
144 views

### Water Difference

While solving a puzzle, I misinterpreted the whole thing and ended up creating a new harder puzzle. Here it is: You have 2 cups filled with water, cup A is 5oz and cup B is 3oz. How can you get one ...
115 views

### Calculate cost of excess water consumed [closed]

100 Liters of water is available equally in a month for consumption among 5 members @ 1 dollar per liter. If some members don't use their own available 20 liters, it can be used by the others at the ...
707 views

### Can you find the value of the question mark$\color{red}?$

Puzzle: Find the value of the question mark $\color{red}?$. $$(2, 13, 47)$$ $$(5, 7, 19)$$ $$(8, 1, \color{red}?)$$ Hint 1: $\color{red}?$ is a prime. Hint 2: $\color{red}?$ is a cyclops. ...
492 views

### Labelling a graph with a partition of 100

Label the vertices of this graph with positive integers (repetitions allowed) whose sum is 100 in such a way that any pair of vertices are joined by an edge if (and only if) they have labels with a ...
8k views

### How Will You Get 100 Fruits in Rs.100?

Source: https://www.bissoy.com/720699/ For Rs. 0.5 you get 1 Cherry. For Rs.3 you get 1 Orange. For Rs.5 you get 1 Watermelon. Your mother told you to get 100 fruits for Rs.100. ...
266 views

### The A-B chocolate puzzle!

Imagine you have 2 types of chocolates (A and B). You randomly pick up two chocolates at once from your bag in a specific pattern. If the same type of chocolates come out, you give them both to your ...
304 views

### Sufficient time to fill the bucket [closed]

Suppose that we have a pierced bucket, and that the hole empties the bucket in four hours. We place the bucket under two faucets at the same time. If the bucket weren’t pierced, the first faucet would ...
544 views

### Choosing units for drug testing

Here's a third puzzle that I found in a book, slightly paraphrased because I don't entirely remember the format of the original. A medical researcher is trying to test the effect of a certain drug ...
2k views

### Mathematics IQ puzzle, solving puzzle by looking at neighboring digits [closed]

Can anyone solve this puzzle? I have tried many times but I could not find any symmetry or sequence. \begin{array} {|c|c|c|} \hline 3&25&5\\ \hline 16&9&6\\ \hline 125&36&18\\ ...
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### You're invited! Now what?

(semi-interactive puzzle) BRIIING! BRIIING! BRIIING! You wake up with a start. It's 6:30... already!? Darn. You roll slowly out of bed, preparing for the day ...
4k views

### make a green profit in roulette

Story You meet a rich drunk CEO at a roulette table in Vegas. She explains to you that she has a way of almost guaranteeing a profit at this game by betting on only black. In the process she gets ...
1k views

### Find the next number in the sequence below?

Find the next number in the sequence below: 298 209 129 58 ? Source: Briddles.com
15k views

Suppose you have 100 lbs of cucumbers and these cucumbers consist of 99% water. You decide to leave the cucumbers in the sun for a while until they consist of 98% water. You bring the cucumbers back ...
3k views

### Where has Jones lost 1 Rs?

Jack and Jones are brothers and they both sell apples for living. Jack sells 2 apples for 1 Rs and Jones sells 3 apples for 1 Rs. They each have 30 apples. Hence, Jack earns 15 Rs a day while Jones ...
2k views

### How to use the numbers 3, 5, 6, and 7 to get 100? [closed]

Any mathematics symbols and processes to use the numbers 3, 5, 6, and 7 once each to get 100.
299 views

### The “Perfect” Lineup

Alice is the head of her high-school quiz bowl league. She is in charge of choosing who will play in the next quiz bowl tournament. She has executive authority about who plays when, and she can change ...
1k views

### Find number by solving the pattern

I need to solve the pattern in given format 98 | 54 | 78 7641 | 3120 | 5402 714 | 494 | 726 ...
1k views

### Two functions that can't be applied in different order to arrive at same result

Here's my puzzle: Write two unary functions f, g and provide an input x so that only the ...
267 views

### What will be the answer?

What is the answer of the given puzzle? Please send solution. ...
578 views

### Find the value of the addition of dice [closed]

Given these: Find the rule, and provide the answer to "?" (the last row). EDIT:Even though "+" denotes addition, it should not be taken in a tradition sense. The positioning and pattern could affect ...
277 views

### Integers around a circle with consecutive pairs differ to a square

Inspired by this puzzle : Integers around a circle with consecutive pairs adding to a square The integers 1 to 50 are placed around a circle in such a way that the difference of any two of them which ...
1k views

### How long was my vacation?

The weather during my vacation was as follows: It was cloudy on 13 different days, but it was never cloudy for an entire day Cloudy mornings were followed by clear afternoons Cloudy ...
2k views

### How many Donuts? [closed]

Three friends went on a camping trip and on the way they bought N donuts 🍩. They put them in their tent 🎪, and went swimming 🏊. One of them came and divided the donuts in to 3 equal parts, fed ...
296 views

### Magic: the Gathering Challenge: Getting Stuffy In Here

first time posting a puzzle in a while, thought I'd bring back some MtG related puzzles. Enjoy! BACKGROUND: The usual magic rules apply here. Please be explicit in mana usage in your solution ...
204 views

### Replacing the chip problem [duplicate]

There are $13$ white, $15$ black, $17$ red chips on a table. In one step, a person may choose $2$ chips of different colors and replace each one by a chip of the third color. Can all chips become the ...
475 views

### Professor Delvershys calculations

After spending half of the night with important calculations Professor Delvershy arrived late this morning. To his dismay he discovered that one of his students used the unexpected spare time to ...
697 views

### What is logic behind this?

If, 1111 = r 2222 = t 3333 = e 4444 = n 5555 =? What is the output of 5555? What calculation needed to calculate alphabet behind 5555?
443 views

### Smallest number you cannot make using 1, 2, 3, 4, 5, and the four basic operations

Given how simple this is, I'm not sure if it has been asked before. But I did try searching everywhere and didn't come up with anything. It is based on these two questions I happened to stumble upon: ...
7k views

### Rendering the number 10,958 with the string 1 2 3 4 5 6 7 8 9

Brazilian mathematician Inder Taneja has found a way of expressing every number between 1 and 11,111, except 10,958, by inserting mathematical operators in between the numbers 1 2 3 4 5 6 7 8 9 and ...
279 views

### Another Simple Math Problem? Really?

Yup, I'm adding yet another Simple Math Problem to the recent trend. Here ya go! Given that: \begin{array}{ccccccc} \begin{array}{c} 1-1=0\\ 1+1=2\\ 1+6=7\\ 2+5=7\\ 5+1=6\\ 6-5=1\\ 9-7=2 \end{array}...
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### Simple Math Problem #2

Link to previous puzzle Simple Math Problem #1 (not linked to this one) Here is another simple math problem. Can you solve it? Examples: $25 + 12 = 33$ $37 + 13 = 44$ $40 + 24 = 66$ $64 + 26 = 88$ ...
643 views

### Simple Math Problem #1

Here is a simple math problem. Can you solve it? Examples: 678+57-24*2 = 7 265+34-12*3 = 8 328+58-22*1 = 12 Problem: 541+13-21*0 = ? HINT 1: Will see if this hint makes any sense or will edit ...
274 views

If RAT = (R+A+T) × R×A×T,then what is RAT? Are there possibilities other than 000, 135, 144?
1k views

### Determine the Maths Function [closed]

You found yourself in a weird room, there was no doors, but a limited computer with no internet that has open an app that is displaying the following message: f(0) = 0f(1) = 549f(2) = 646f(10) = ...
6k views

### How to get 5 from 0,0,0 and 1?

Can you use the digits 0,0,0 and 1 each only once in a mathematical expression for the number 5 using only common mathematical symbols with at least 1 mathematical symbol between each number?
703 views

### How do I solve this odd puzzle?

I need help. Try to solve this puzzle. It's a blend of mathematics and words. The goal of word math problems is to assign each letter an integer value, 0-9. An example is below. Example: ...
261 views

### Difference or addition on a rose petals

Arrange the numbers 1 to 20 onto the rose petals using these rules : Yellow petals contain odd numbers, white petals contain even numbers. The outer petals are the difference or addition of the inner ...
298 views

### 5555=? Which letter goes in place of the question mark?

I have found this puzzle on the internet but I didn't get any answer yet, so help me out. For rules see the given image: Here you can either give clues or may explain your answer.
2k views

### what will be the answer for 888=? [closed]

I found this puzzle on another website and I wanted to share it here. I will post the source link after a week to avoid spoilers. Here are some rules: if: ...
1k views

### How is this possible? [closed]

One day, I was going to school. I saw an old man. He said that he will pay me if I answered his question properly. If we add 2 into 10 it will be 8, i.e. 10+2=8 If we subtract 2 from 10 it ...
242 views

### How to tell if a Mathematical Rubiks puzzle is solvable

I recently came up with a series of mathematical puzzles based loosely on Rubik's puzzles(or should I say combination puzzles). They go like this: you have an n x n group of numbers where you can ...
14k views

### How do you get 23 using the numbers 1, 2, 3 and 5?

You can only use Addition, Subtraction, Multiplication, Division. This is for a math project for my daughter. You can only use the numbers once and all numbers do not need to be used.